17983993 has 2 divisors, whose sum is σ = 17983994. Its totient is φ = 17983992.

The previous prime is 17983981. The next prime is 17983997. The reversal of 17983993 is 39938971.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17740944 + 243049 = 4212^2 + 493^2 .

It is a cyclic number.

It is not a de Polignac number, because 17983993 - 2¹³ = 17975801 is a prime.

It is not a weakly prime, because it can be changed into another prime (17983997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8991996 + 8991997.

It is an arithmetic number, because the mean of its divisors is an integer number (8991997).

Almost surely, 2^17983993 is an apocalyptic number.

It is an amenable number.

17983993 is a deficient number, since it is larger than the sum of its proper divisors (1).

17983993 is an equidigital number, since it uses as much as digits as its factorization.

17983993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 367416, while the sum is 49.

The square root of 17983993 is about 4240.7538244987. The cubic root of 17983993 is about 261.9964308121.

The spelling of 17983993 in words is "seventeen million, nine hundred eighty-three thousand, nine hundred ninety-three".